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Are your dog's eyes moving back and forth?
Is your dog standing with its legs further apart then normal?
Is your dog walking on an angle and can't walk a straight line?
Is your dog holding its head at a tilt?
Is your dog nausea or eating less?
Is there any discharge in her ear?
Any scratching of the ears?
Has she had any bones, rawhides or eaten any non food items ingested?
Is she able to defecate?
Is she eating and drinking?
I asked the questions about the swaying and eye movement because dogs can develop vestibular disease from old age and ear infections and even growths that affect the vestibular system. Symptoms include standing with legs spread out, swaying, head tilt, abnormal eye movement, walking sideways, falling over and may include vomiting. There are a few things that can cause this condition such as an ear infection, some medications and old age. Here are some great sites on this condition:
However, if your dog was chewing on sticks in the woods, there is the possibility that she has developed an obstruction. You can read about this here:
In addition, sticks can splinter and puncture the gastrointestinal tract causing peritonitis.
I'm also concerned that she may have ingested something poisonous which is causing the symptoms you see. For the upset stomach, you might try some pepcid. Read about Pepcid dosages and usage information here:
However, I really feel your dog needs to be seen by your vet given the incoordination, neurological symptoms and vomiting. I hope this information is helpful to you.